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J. F WHITE.

BAG FOR CONTAINING CEMENT AND METHOD OF MAKING SAWS.

APPLICATION FILED APR. T. 1826 1 1 95,3 1 1 lzlt'vnfml Aug. 22, 1916.

%M0 93 g Mag UNITED STATES PATENT OFFICE.

JOHN F. WHITE, OF CHICAGO, ILLINOIS.

BAG FOR CONTAINING CEMENT AND METHOD OF MAKING SAME.

Application filed April 17, 1916.

T 0 all Whom it may concern:

Be it known that I, JOHN F. WHITE, a citizen of the United States,residing at Chicago, in the county of (look and State of Illinois, haveinvented certain new and useful Improvements in Bags for ContainingCement and Methods of Making Same, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to an improved method of producing cement bagsand in the article produced thereby.

Heretofore many attempts have been made to produce economically, acement bag, which could be reemployed after use and which could beeconomically manufactured. Owing to the now recognized importance of theindustry, it has been the desire of manufacturers to secure a bag whichwould receive ground cement and retain the same without sifting throughthe meshes of the cloth or canvas and which would prevent moisture fromentering through e sides of the bag. The present invention 58 designedto Ineet this demand and is produced by the following process. A stripof can as of a Width substantially the required length of a bag iscoated in any convenient manner with a coating of a hydrocarbon compoundhav-- ing an asphalt base. In this particular I have found thatpetroleum residuum approximately seventy per cent, mixed with thirtyparts asphaltum or the equivalent of these two substances and subjectedto heat, can be applied directly to the surface of the bag material. Inthis condition the surface coating is tacky and sticky. After thematerial has been properly coated with a layer of the substance, it iscarried over an edge-forming roll where the edges of the material areturned to form a hem, the turning of the material being in the directionof the coated surface. By passing over the roll under ten.- sion theturned-over edge is drawn. tightly onto the sticky surface of the bodyof the fabric and is there held or set, so as to be come well secured inits turned-over or hemmed position. This turning-over of the edge of thefabric is conveniently along Jue selvage and represents a reinforcededge to the bag presently to be described.

The material is carried from the rod a short distance and thereafter hasto its coated surface powdered tale Specification of Letters Patent.

Patented Aug. 22, 1 916.

Serial No. 91,678.

substance which will render the surface treated nonadhcrent. In thiscondition the material is allowed to dry for a period of time and thenis ready for use in the manu facture of the bag.

In the drawings: Figure 1 is a diagrammatic view of an apparatusemployed in carrying out the method, and Fig. 2 is a detail view of thebag.

In the accompanying drawing there is shown diagrammatically the hemmingroll at A. i

B represents the tcnsioned fabric passing over the roll, its untreatedface being against the roll.

C represents a turnover pin which may be held by the hand of theoperator which causes the selvage of the material to be turned onto thetacky treated surface of the same, and in this condition, owing to theincreased thickness of the material at the hem, the turned-over portionis drawn tightly onto the roll and there set and held, thereby avoidingthe necessity of a prcsscr roll. or other pressing means.

(7 designates the powdering box through which the material 3 I Inproducing the a: mic it has been found heretofore that when the edges ofthe open mouth of the bag have been stitched, the lock-stitch usuallybeing employed, a very thick portion is present for the pressure foot ofthe machine to pass over, and again it has been found necessary toemploy the step of stitching prior to the closing in of the sides andbottom. of the bag. In the present method it is only necessary to takethe material and place the side and bottom edges together and lockstitchthe edges in the usual manner. The bag is then turned with the treatedside in, leaving the hem in a condition where it will maintain its position while the inside of the bag has the desired rc- 'if wering the samesubstantially impervious. Inasmuch as the coating material is more orless tacky and soft, as distinguished from a hard or nontacky material,the cement as it comes in contact with the surface adds additionalpowder thereto and thereby renders the bag useful for sub sequent use asthe treated surfaces will not then adhere to each other.

I desire it understood that the invention is not limited to the use ofthe particular material hera specified.

IIO

Having thus described the invention, What is claimed as new and desiredto be secured by Letters Patent is:

1. The art of producing water-repellent bag material consisting inapplying to the surface of woven fabric a Water-proofing tacky substanceof a hydrocarbon nature turning the edge of the fabric overonto theadjacent tacky surface of the body of the same, causing the turned-overedge to be tightly drawn onto the surface, and subsequently coating thesurface with powdered. substance.

2. The art of producing a 'bag making fabric consisting in applying toone surface of the fabric a hydrocarbon substance haV- ing an asphaltumbase, and turnin the edge of the fabric over onto the adiacent treatedsurface of the body thereofand tightly forcing the turned-over edge ontothe body, and applying to the treated surface a powdered substance.

3. The art of hemming the edge of fabrichaving a water repellentadhesive surface coating, consisting in folding the edge of the fabricover onto the adjacent treated surface thereof and by pressure exertedlengthwise of the fabric to set the said overturned edge tightly ontothe treated face of the fabric.

4. A cement bag having its inner surface coated with a water-repellentsubstance, and the edge of the open part thereof being turned down ontothe adjacent part of the 1 body to form a hem and held in its turneddownposition by the treating substance, 1

In testimony whereof I hereunto affiir my signature in the presence oftwo witnesses. -'JOHN F, WHITE.

\Vitnesses:

WALTER W. HISS,

HELEN A. NYMAN.

